diff --git a/include/linux/if.h b/include/linux/if.h
index a023ec1..8018c2e 100644
--- a/include/linux/if.h
+++ b/include/linux/if.h
@@ -60,6 +60,7 @@
 #define IFF_MASTER_8023AD	0x8	/* bonding master, 802.3ad. 	*/
 #define IFF_MASTER_ALB	0x10		/* bonding master, balance-alb.	*/
 #define IFF_BONDING	0x20		/* bonding master or slave	*/
+#define IFF_SLAVE_NEEDARP 0x40		/* need ARPs for validation	*/
 
 #define IF_GET_IFACE	0x0001		/* for querying only */
 #define IF_GET_PROTO	0x0002